{
  "port": 1533,
  "protocol": "tcp",
  "service": "Sametime Community Server (virtual-places)",
  "oneLiner": "The IM and presence port for Lotus/IBM/HCL Sametime Community Servers.",
  "whatItIs": "IANA registers 1533 as \"virtual-places\" to Avshalom Houri, whose Ubique work became IBM's Sametime, so the registration and the real use are the same lineage under different names. A Sametime Community Server listens on TCP 1533 for the proprietary Sametime community protocol carrying login, presence, buddy lists, and instant messages; the client's \"Direct connection using TCP/IP\" preference targets exactly this port. It shows up on scans of Domino/Sametime infrastructure inside enterprises that still run HCL's collaboration stack.",
  "exposure": {
    "verdict": "never",
    "note": "This is an authenticated corporate IM plane carrying credentials and message content over a proprietary protocol — publish it through a Sametime proxy/edge tier or a VPN, not by exposing the community server itself."
  },
  "checkCommand": "nc -vz -w 3 TARGET 1533",
  "links": [
    {
      "title": "IBM Sametime 9.0.0 — Connecting a client through a direct connection over TCP/IP (default port 1533)",
      "url": "https://www.ibm.com/docs/en/sametime/9.0.0?topic=server-connecting-client-through-direct-connection-over-tcpip",
      "kind": "official-docs"
    },
    {
      "title": "HCL Sametime — Managing client connections",
      "url": "https://help.hcl-software.com/sametime/9.0.1/admin/admin_st_manage_client_connect.html",
      "kind": "official-docs"
    },
    {
      "title": "IANA port registry — 1533",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=1533",
      "kind": "iana"
    }
  ]
}